Synthesis, characterization, and physical properties of two new magnetic organic metals, (BEDT-TTF)(sub 4)(C(CN)(sub 2)CONH(sub 2))CuX(sub x) (X = Cl and Br(sub 0.77)Cl(sub 0.22))

摘要

Two new BEDT-TTF based charge transfer salts, (BEDT-TTF)(sub 4)(C(CN)(sub 2)CONH(sub 2))CuX(sub 2) (X = Cl and Br(sub 0.77)Cl(sub 0.22)) have been synthesized and characterized with use of X-ray diffraction, Energy Dispersive Spectroscopy (EDS), and Raman spectroscopy. ESR spectroscopy reveals that the anion layer contains 3% of paramagnetic Cu(II) species which exhibit Curie-Weiss behavior with a Weiss constant of (theta) = (minus)2.8 K. Both compounds are metallic below 150 K. AC susceptibility, RF penetration depth, and RF impedance measurements under pressure do not reveal signals of superconductivity.